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A 200-m-wide river flows due east at a uniform speed of 2.0 m/s. A boat with a speed of 8.0 m/s relative to the water leaves the south bank pointed in a direction 30 degrees west of north. What are the (a) magnitude and (b) direction of the boat's velocity relative to the ground? (c) How long does the boat take to cross the river?
A bag of cement of weight 375 N hangs from three wires as suggested in Figure P5.18. Two of the wires make angles θ1 = 55.0° and θ2 = 25.0° with the horizontal. If the system is in equilibrium, find out the tensions in the wires.
What approximations or simplifying assumptions must you make in the calculations? (Note: Some of these choices are false because they are wrong physics!)
A 10000 kg boxcar traveling at 20 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 11 m/s. What is the mass of second car.
A steel beam is suspended completely under water by a cable that is attached to one end of the beam, so it hangs perpendicularly. Another identical beam is also suspended completely under water, but by a cable that is attached to the center of the be..
A 13 g bullet traveling 215m/s penetrates a 2 kg block of wood and emerges cleanly at 157m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
Problem on the velocity of boat
Assume we have an infinitely long wire carrying a current of 2.50 A. It is bent into an L-shape extending into positive infinities along x- and y- axes. Find out the magnitude of the magnetic field at a point P with coordinates (0.30 m, 0.30 m)
A 1.5 kg copper block is given an initial speed of 3 m/s on a rough horizontal surface. Because of friction, the block finally comes to test. If the block absorbs 85% of its kinetic energy, calculate its increase in temperature.
To move a large crate of mass 30.05 kg across a rough floor, you push on it with a force at an angle of = 22.8° below the horizontal. Compute the acceleration of the crate if the applied force is 382 N and coefficient of kinetic friction is 0.486.
Assume that positive -axis is directed toward the direction of motion of cart 2.
An ocean liner leaves New York City and travels 56.0° north of east for 170 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the following directions.
An oil film with n = 1.45 floats on water. It is illuminated by white light from the sun at noon. If the film is 280 nm thick, find the wavelength and color of visible light that is most strongly reflected upward to an observer positioned above th..
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